2015-10 Security Bulletin: Junos: vSRX-Series: A remote attacker can cause a persistent denial of service to the vSRX through a specific connection request to the firewall’s host-OS.(CVE-2015-7749)

Product Affected:​vSRX-Series

Problem:​A malicious attacker can cause a denial of service to the vSRX PFE daemon by issuing a specific connection request to the vSRX host-OS.This issue is assigned CVE-2015-7749

Solution:The following software releases have been updated to resolve this specific issue: Junos OS 15.1X49-D20, and all subsequent vSRX-Series releases.This issue is being tracked as PR 1085900 and is visible on the Customer Support website. This issue was found during internal product security testing.Juniper SIRT is not aware of any malicious exploitation of this vulnerability.No other Juniper Networks products or platforms are affected by this issue.KB16765 – “In which releases are vulnerabilities fixed?” describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.​​

Workaround:​Protect the vSRX Series services gateway host-OS from unauthorized access by limiting the exploitable attack surface by implementing access lists or firewall filters from trusted, administrative networks or hosts.

Implementation:How to obtain fixed software: Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of “PRs fixed” can be provided on request.Modification History: 2015-10-14: Initial publication

Related Links: CVSS Score:7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level:High

Risk Assessment:Information for how Juniper Networks uses CVSS can be found at KB16446 “Common Vulnerability Scoring System (CVSS) and Juniper’s Security Advisories”

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